Drilling-machine.



H. T. DUNBAH.

DRLLING MACHINE.

" APPLICATION FILED MAY zAI 1912.

Patented Mar. 2l, 1916.

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H. T. DUNBAR. DRILLING MACHINE. PPLLCATION FILED MAY 24.1912. i 176 O41.Patented Mar. 21,1916,

9 4 SHE'ETSHEET 2.

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H. T. DUNBAR.

DRILUNG MACHINE.

APPLICATION I-'ILED MAI/24,1912.

Patented Mar. 21, i916.

` 4 SHEETS-SHEET 3.

w 2J' A 7. w 5 I 5 D f w 7. 7 6 .u Wm I my d I APPLICATION FILED MAY 24.1912.

Patented Mar. 2l, i916.

v 4 SHEETS-SHEET 4.

" i INvNTn "ingis-a specification. l 'relates ftoa `drilling` maf s moreparticularly 'designed ry. tq'uiastinglfhe Sama aithopghihis h"e:maylalsobeLusedfor drilling rook here f and* Afcryother ypurposes.

ma y attempts l have hbeen r'ock.` ,Whenfdrilling y holes 'pneumaticfhammers "yvill ahhe purpose' but |`when these .holes are gularf It fis'-`possibllffor thebit to th me" spotseveraltimes insucargelchipsreliable to be formed er andtliisnecessitates pulverizingthese they7 can@ so removed." `Inl order to sfthe diameter oftherbitfmetei'yvf the barfto lsuch (of, at, least. g of an inch-Dammusi-'MACHINE Specification of Letters Patent. Patented Mar. 21,1916. gippiicafipn flied may 24, 1912. serial No. 699,394. y ,4

l iznof .the-dUnited",States,' residing `at "lalginvthe`countyof *Erieand State of 5 -Nevv York, have inventedfnewf andnseful vementswDrillingt- Machinesy f;

dii'illingfliolesfincroclrsunder water pre-f chip thus formed must bepulverized While.

' loose. Thsresults in delay and reduces the l feliciency I and capacityVoit' the machine.

vSuch chips sometimes fall from a Seam beeapen handy simplify the iatively Ydeegifor located at. a considdistance-freni the sourceof powerthe "`tween"th`bit 'orrchis'el and the motor f Ql'gfnd Ynptgonlv rendersit 'imprac-,

' e machinetbut the barV Qthe rapidv hammeringt v"Inorder to overgenand.heavier havebeen employed which ting drill Abar; in order.

, men to yoperate each drill. the fact that in submarine drillingthedrill rcevspeed, injdrlling'. 'In Agrnachines the bit-was r'of a`'ratchet mechanism machine.` H-Notwithstanding that this thetspacln'gof thebloivson 'the rock 'lbelvvashedfiit of 4the holes by o fthe"proper `"degreefof; fineness be? `guided so as to hold them inl positionand ay hegflinsertedr betweenf'the.

"DUNBAR, y or `BUFFALO, `maw vomi.

. dvi/1 in use are also disadvantageous on acs/count of `theirexcessivey Weight and also because; Vthey strike too heavy a blowregardless 'of the `.direction in which the drilling is being done. Suchheavy blows are liable to produce a large chip in a drill hole when thedrill approaches a seam` inasmuchl as the bridge or last vpart of therock before reach-` ing 4this seam often breaks down and theV hind fthebit-or ygravelor chips wash-from abovefinto the holeand jam" the drillbar so that `great power is requiredto pull the bar and chip out of thehole; Often times the barcaunot be so removed afnrd must bev left inrthe hole, thereby. not only losing the bar 'but also the time spent informingthe 'l5 hole. l Owing to the' .greatweight of the drilling`machines heretofore in use and the number of parts which requiredmanipulation it has been' foundnecessary to employ a number 'of Thisisdue to bars are often forty feet in length, `two inches in diameterand provided with a bit which is three and a half inches in diameter.'This necessitatesthe,employment of a large' number ofmen and hydraulicran'is or steam Winchesfto handle the'l drill bar'in the variousnecessary'operations.

It is the object of this invention tov reduce some of the difficultiesof drilling .above mentioned.- Withthis end in view a. reciprocating'`hammer bare; of comparatively y small diameter is employed which isoperated tosti-ikea numbercf blows per'minutey 95 'much less than thepneumatic hammer and fmuchmore than in the heavy type of rock f drillsnew in use, which hammer bar and the bit .operated by; the `hammer barare prevent 4deflection of -the bar under the i thrust which .the samereceivesl from` the vmotor.v The guide tube serves'also tokep chips fromfalling behind the'bit, the diameter ofbit exceedingthat ,of the guidelby the small amount necessary to give chan` mel to the therein.l

Wash water and pulverized stone tuoA 1 l eration and the partscomparatively lightin weight so thatl a crew of men .with a boiler,

pumps, &c., .of a capacity heretofore neces sary for operating a `singledrilling machine of the typeheretofore in use can operate a number ofdrilling machines which are constructed accordance with my invention.

tive regular spacing,the idea bein to strike a'large number of closelyspaced vlows'and tlildgh"A the guide: bldws `the bridge at the seams inthe roclz'4 are-.also not liable 'to be broken down so soon,

Owing to the4 light Athereby reducing the sizeof the chips which byreducing the interruption of the drilling otherwise Supported.

` same.

are vformedhwhereby the work of pnl-verizing the chip-'sto permit ofwashin them out of.' the hole islessened. HThe liability of jam mingoli-locking the drill bar in the hole and losing the'-'sa'me'isg'reduced to a minimum. By reducing the cubical contents ofthe hole,

operation, by enlarging the number of.rnachines which any certaincrew'canf-opera'te the Ycost of drilling per foo-t i s "m aterially Inthe ,accompanying drawings consisting`- of 4 sheets: Figure 1 isl avertical longi' tudin-al section of the upper partv ofone form ofdrilling machine embodying" my inventioin-y Fig. 2 is-a verticallongitudinal section, on an enlarged scale, of' the lower Y* part ofsaid machine', Fi 3 Iis a side elevation of the lower` part o thedrilling ma' chine lshown in Fig-'2.' Fig. 4 is a bottom plan Iviewofthe 'bit'l and tubular guide vof` -thepart's shown` inFfigs. 2 andB.Fig. 5 is` a horizontal section taken in linea-5, Fig. 2. lFigr is a`vertical longitudinal section of the upperA part of another :drillingma-'1 -chine constructed in accordance .with m invention. Fig- ,7 is averticallongitudlnalgsection of.: the lower part-of the last mentioned.orm'of drilling machine.. Fig. 8= isavertical longitudinal section,onanen. larged scale,l of thc'construction s hown'in` Fig. 7. Fig9 is abottom plan View ofthe section, on anenlarged Scale,.taken inline1-l-11, Figa?. Fig. 12. is a vertical longitudinal section' showingstill' another vform of bit, hammer bar and the means for guiding thevsame embodying my invention, the

section being taken in line'12-'12 'Fig. 14:.` Fig..13 is a similar,section of thelastgmentioned parts taken in. line I3-132i;Fig."114i.,A

e carried u and awayV atgwhich is. continuously orced clowi'i' vReferrmg. to. Figs." 145,' 1 represents the to the cylin Fig.' 10 is ahorizontal section-taken. in line `10-.10,Fig. 8. ;Fig. 1'1 'visa cross..not shown` v Extendingupwardly, fromv the frame' and f 'inclosing therecipnocatingengine," its valve 120ii --mechanism andthecolnpressedpair' su ply 4tfal'section taken-in' line 16-16, Fig'.Y15.'V Fig.

` lizedto-hold thev same to its' work.

Similar characters of reference-indicate 'corresponding views. 3o

`main frame ofthedrilling machine whi'chlA may be of any suitableconstruction to'support the main working parts of the drillingmechanism.l l`Inthe position `of'th e parts g5' 'shownin Figs.` 1,52 and3 the machine isadapted for drillin a hole in a yrock downi Wardly, thishein -lePsiti'on in which the machineis u fwhen boring'rocksubmerged inwater while the machine ismountl- `on a vscow floating-upon' the wateror is'" Onthe upper part of -this framel 1s mounted a `reciprocatinlengine or'motonwhereby motion is' pr uced or delivering hammer lblows'with comparu- 915 tive irequcne'yy againsta bit or-"`tool 2 which i ydrills the Vhole in the rock. This motor ma .1 4be of an suitableconstruction but .is pre -pf Aerably o the well known air operated type`:and only the', main elements of the same are `10o therefore s hown in'Fig. 1: Asthere shown this motor comprises fanfupright working cylinderand having a piston rod 5 project- 105 a stuiing box 6 at the; lowerend-bf the c 1- ind'er, and a pipe .7 connected with the c 11nder andadaptedy to supply\comp air lowering' the vpiston -fthferein The/valve4l mechanlsm'wherebythe compressed' 'air isiadmitted into'andexhausted rom opposite ends ofthe working`cylinder-for raisingand,

` lowering its, piston forms no artofthls in- @1115 'vention and as thesame may of any suitable construction `the details of the same are .fpipe or tubeis a' casing'S Whichi-risesa oye V .the waterlevel and 'is.adapted^ 'to. l'rotgct the engine and the 'parts'connect vthe waterThiscasingjns therefore made of the required len'gtnj-tosuit the.articular depth `at which the Surface of 't e. rock l to be drilledisarranged belowjthesurface parts throughout the severalier foralternatelyralsing and 11p main" iframe" which,'charnber` `jincloses.the

^ stuiing box1 Gvatj` the "lower" end of thecylinfden `pf'ancl islpreferably made waterwtig'htl 'orpurposes which will Ypresently appean`y fo white isppefembiyef cylindrictifgrm ross wsectiongand*wherebyVahammer hammer bar is arranged? in' an i opening ijrrnedinv the lowerhead :ofthe chamber 9 ton `rod within"thischamher; The connecytfion'between'these two rods may be effected drawings being suitablef andcomprising" an "5@n.gheeouplingfysieeve 11 having utmp-` erf 1nd n lowerends offits bore tapered inv wardly Jandfadaptedf toreceivey the corre-Mspending ,tape'iu e'` ends fof kthe piston prod l"hammerbar whiehwaresecu-red- `within l andlowei" fbodyisections" and the coupling`sections` off a guide]` tube which is e enlarged "part llanditsjendsprovided w 'th Xternal` screw "threafds 17 which ent n "gagelwithinternalpthreadsin thel opposing fe ds]lofftivo#intermediate body.,wsectiofns.

n i perwendgalso connected'with `"the flower end l I. l b'y\one```otitheA 'coupling sleevesfil." The i Jnumberwandl,length fof"kintermediate body l mdf. oupling'xsections] which are employed anta;that `Shawniniiiigs.` 2, a, 14 and 5 issuitable;'and-comprises'angupright shanlr 1.8 arranged within` thelowermost coupling t ongfl andTtheadjecentbodyLseetions'of ide "tube, aplurality of cutting blades,` In p teeth $19` f projecting laterally pfrom represents anlfupri'ght'hammer 4bar or l i i i u i i i i l 4 n iblow "iis delivered against the drill b1t."` This and l isf preferablydetaehably connected at i ivtsgupperend withgtheflowerend-{of thepis-lby any suitablemeans5` thoseshown in them means of ,the up 13,1 14 irepresentfjthefupper,. intern'fie?v e' is ait-ranged,A

o the lowerrnost intermediate l bodyI section,

werf :endo'f gthefshank and each `havn itslower edge constructedinttheform 'of a chisel or cutter; and anenlargement,

collar or stop QOrmed-at-the upper end of the shank Within'the lowermostintermeranged in the form of a cross, as shown in inflongitudinalnotches or recesses 21 formed 'in the lower end of vthe, lowermost bodysection of the. guide tube'and project laterally 'beyond the peripheryof :this tube so that the diameter of these blades taken diete bodysection. .The blades of the bit are preferably four in number" and ar`17o,

`Fig."4=, and these blades `are arranged withcollectively is greaterthan thed'ianieter of` the guide tubeon the ottside thereof. During theoperation of drillinga hole in the rock the bit rests with its lower orcutting edge upon the rock, theguide tube rests by u per end. of itsnotcheslon the yblades of the bit, and the frame of the machine andassociated partsare Vsupported,

l`by the guide tube,"in which 'position of thesepjarts the lower end ofthe lowerm'ost b ody"section `is arranged above the lower bitfis,arranged above the upper edge of .the v lowermost coupling section.Upon starting `the reciprocating engine while the parts arein thisposition the hammer rodedg'e of the'bitfy and the stop collar ofthe l`or bar will be raised and. lowered cpntinuously and caused to' strike ahammer blpwagainstthe upper end of the bit shank dpring" each downwardstroke, wherebyjthe cutting olf-chisel edge of thelatter is"` drivenwith a cutting action into the surface of thel rock `against whieh` thesame rests vin substantially thesame manner in which a *"stone'cutterstoolis diivenagainst the surface'of the stone.

` In Order to 'reduce ae aan nhs guide i tube and the hammer rodthisguide tube and. the hammer ybaryare made col'npara-v tive blowagainst the bit the couplinggsecaround thefperiphery ofthe hammer bar.While the drilll bit issubjected to the blows of the hammer bar thelsaine is also turnedso as to engage the samewith a new part closetively small in diameter, andi in -order to I f y prevent undue lateralydeiiectionof Athe han1V p mer rod so that the same delivers aneii'ections l15 of the guide sleevehav'e their bores' V'constructed to ifit comparatively of therock for each blow of the hammer v bar andthereby cause thevrock to Abeeut n away in comparatively.- smallbitsorchijps A which can' be subsequently easily removed by astrearn'o-E water.` This turning :movement of -th'e bit is `preferablyeffected thyu 'I mechanism which operates upon the upper cesses lat thelowerk edge ofthe lower body section ofthe lguide tube. @The means forturning `the guide tube and bit which are n part ofthe guidetubesothatthe latter is turned together with the bit which is inter-,loclrfed therewith by yengagement of the `blades of .the bit with 'the'notches vor re;

tty-thea dil ha,

shownin Fig. y1,for example, .comprisea f horizontally rotatablegearwheel 22 which hasa hollow hub 23 journaled ini abearing 24 atthelowerend of Vthe frame rand rei ceiving the-adjacent part ot the upper;guide tube section '12, 'a plurality of upright bolts 25'secured to thelower-side of the gear wheel and arranged in openings formed in ian'annularflange 26 on vsaid guidetube lorffsection', a water motorhavingits casing w27 arranged on the lower'part of themainv 4frame andprovided on its driving y shaft 28 witha pinion 29 engaging'with thegear wheel 22, and a'w'ater supply pipe l50 lead-r ing"i..,frornl a pumpon the lscow ,or lother motor for 'operating upon" they 'blades cr i pbuckets which are. 4securedto vthe' vshaft28 withingthe casing andthereby'turning the ,20 pinion and the parts operatively connectedtherewith. The gear wheeli. .22 is held .against axial 'movementon theframe by en'- gaging its upper's'ide `with the lower-end of the bearing24 and wprovidingthe upper vr end ofits hub 23k, with a lateralprojecting y e flange 31`which engages` With vtli'eupper end of saidbearing, astshovvn in Fig. `1. Whiledisintegration of the' stone or rock`is being 'effected by the blows o f the harn- Inei"A bar against thebitthefchips orpiilverized 'rock resulting from thecutting ac- .tion of thebitis preferably Washed outlor` the i vvhole continuously so as topermit the :bit to v "work ywith-the greatest freedom and elli;-

5.. c1ency. ,For this purpose Water under pressure i isA preferablydelivered into the upper I end of the guide tube andconducted down- 1 ey wardly through 'the same and discharged at 4.thelower end thereofadjacent to the cutting 40edge'of thebit, whereby the bits of stone'.are carried upwardly out oftheholethrough theannular space' of theguide tube andl tlfi bore 'of th'euhole tothe "exterior of the roc Thedischarge of the Water `together with` A V541 the "bits 'ofstone from.the hole )which isz 1. being 'bored is' possible" owing toth'e'f'actjth'at.the',face of the chisel is of' largerv di`panlieterfthan'thatI of the guide tube`,.wl1ere byanfannula'r space ofample dimensions 59- is provided -betv'v'een the guide' tube and, the

watefmotoris connected bya pipe 32 'with f-the`water chamber), as'shownin-"Figi- 1.

H "B'y thisjmeans'fthe pressure water suppliedI I BQafterl having"bee 1iutilized @forI fjtur nig'y the guideltube4 and; *the bit "is from the'outlet" lili'ismotor .r

` chines iin general use.-- For the -purposeoi fplermitting the' hammerrod 'and themotor A dust and chips out of thedrill hole.y The lbodysectio1i`of: the "guide tube. By thus giiiiufiiizea for washing nie-mehammer barand thefbore of the fdii'erent `Sectionsof the guide tube aresuch'asto i leave an .annular .space between these parts" jwh-ich 1sample -to provide the necessary 70 passage (for the Wash, Wat

er through i. the

Inr order. toobtain the greatest eI'ective-A ,nessjo'vfthebit onthestone whenthe saine recelvesf the blow of thel 'hammer'. bar the 75shank of this bit is fitted comparatively snug in the lowermostcouplingy section offthe guide tubegandin order toperinit, thepasysageof thewash Water downvvardlybetween thiseshank and therespective coupling sec- 8o tionvl this shank?isprovidedvrith a"A plu-`,rality ofv longitudinalgrooves B3-in. its'pey riphery which serve aspassages forthe Wash water through the guide tubetoj'the ,drill l hole...As the `kilrilling of the hole bythe bit progresses theweight of thebit and the mac 1 ine restingupon the same`.causes the bit l 'i to.automatically follow up. the surface of "the stonexin* the same measure'as thilssurface is rcut away'.I underneath'l the .bit., When 'the 90,hole has beendr-illed to the desired depthl the machiney liftedl fordisengaging the bitandV guide tube from thehole. and then lowered; Aupon another part ofthe rock which is to be .dri11e i,."During thislifting of ih@ bitand 95 guide t'uloe,`the vbit is permitted-to dropl inthe guide tube until its stopcollar engages with the upper'end of thelovverinost coupling section :15; the extent of this movement, beings'determined that when the stopy co1- lar engages'lwith this couplingsection the upper parts ofthe-blades of the vbit will be still withinthe notches of the lowermost 1' .Slidably connecting' the bit with theguide tube the blow-'which the bit receives from the lvhammer bar. isnot ltransmitted to the' guide tube,'on the contrary, the bit Whilereceiving the blow'is permitted lto advance independently of the -guidetube kv vhile:producing its cutting action er1-the stone; l

lhile'the machine is in operation the gap or clear space between theshank of the bit and the hammer bar inthe separateA position of. thesepartswis suchthat'l the valve mecha- 115' nism ofthe reciprocating airmotor willy continue ,its normal' operation for keeping this engine orflmotor running` i In order to autohammer motor. to descend" in itscylinder an i abnormal extentndthereby'shift theports g"of'-this`rvxiotorfsoas toa-crest the operation of lthis-lnotor7 this actionvbeing well known. 125 and similarto that found in thedrillingmapiston'to descend anabnormal distance for arresting the operation ofthis motor the movement on' -the frame and guide tube isv `sejinounteden the mainframe that it `is capable 4of a Vlimited `dewnward per endofthe'shank of the downwardly a sufficient 'extent 'so" as not tdinterfere 'with the abnormal descent of the; to eiect the, iautomatiefstoppage of "the hammer mov-toi'.

hammer har which is` necessary for permitting this longitudinal movementof.A the guide 'tube `relatively to fthe main frame and the enginevcylinder that shown in Fig. 1 consists infarranging the heads 34"`ofthe bolts 25,'soythat'ja gap is forme'd be-l tween the upperqsidoftheseheadswhen the." `j flange 311of--the'jupperguide tube section isengaged lon 4its upper side by thelow'eryside of the gearwhee1 22,.asshown-inFig. 1.

ponlifting.. .tl-ie.; machine the `guide tube slides downwardlyin thehub .A of the lgear wheel `22 and thefstuiing boxY at the lower f endfofthe waterfchamber until the' flange 3110i the'guide tlbeengageswith theheads ofthe bolts 25fwhicl'i latter serve the guide tube `is thus,lowered'reladivelyV to the reciprccating .engine cylinder end of thelcient distance below the lower bar and the hammer barjas" will permitthis ym'ot'o'r pistonftodescend an abnormal disy theshank of the bit and`gine will be shifted within its cylinder into a .position in whichairwill be-again admitted f tanceandshut*off thelsupply of compressed' Uponagain loweringy its bit rests upon the air 'to the. cylinder.` themachine so-that `rock and the `engine frame and .associated parts restuponthe flange ofthe guide tube,

. the hammerv bar will'be tothismotor for automatically restarting thesamewithout `requiring any I mani'pulatio:n

1 for this purpose.

f ed in onepiece for curity being placedwith .its shank within the Fig.5, which permits' thej'same to be readaol 1 the driven gearwheel '37 `oflthe tube rotating The shanlg` `blades and stoprfjcollar/of the bitshown in Fig. 2f are preferably f :onstruct-` greater "durability andseb and in order` to .permit of this form of it lowermpstcouplin'gsection 15 of the guide `tube this coupling section is'preferably divided diametricallygi'nto two parts, `as shown ily appliedto or i/'emoved from theshan'kof thebit.` .In the form of dri ling "theslack` ccnnectibn between the guide vtube `and the cyfnder of the hammeroperatingmotor is pr ducedby. permanently connecting tliegilangej`35'of. the lguide tube 36 with mechanism "and ther lmbvse. ferallyprojeclli normal operation of the .machine is arrangedlthisjfgear.wheel with a latenables the upbit,- to' recede pistoni-todescend an abnormal extent and automatically stop the hainr'nerlmotor.v`Au'- n tomatic starting ofthis `e'ngin e o1.. ymotorlv is" f motor4operated drilling barfrom striking while thesame iS i j 901 butissupportedonthe,guidewubepWhen'f i j f y as stop'lfor blows `.againstthe bitv "limitmgtheextent ofthis movement. enl

the upper endof the' sha-nk ofthe bit is carried a suiiipushed upwardlyby jb the pistenof the en"n nlitted from this air .l Y l 'in variousways, for'lnstance,bythel'means-m l l machine embodying my inventionwhich .is 1shown in Fig. 46

providing theupper A'end of I vent this'bit from ng` flange 39 whichduring the outo engagement' with ,the upper end of the bearingfloof thehub ofthis gear wheel,

as shown in Fig. 6,;butfwhen themachine is'` `.liftedthev gear 37.together with the guide `tube 36 will drop until"the flange 35 engages70 upper end of the'bearing fl'O,"and

:with-the there'bypermit the' of .thei bitte drop away from .thehammerbar a s uiiicientfdistanceto cause the hammer. barlandi motor alsoeffected by again pushing. the guide/tube r upwardly rel in.substantially thejsame kmannerias .d e-l go scribed with referencetothe .constructinl shown in v Fig. formed between;thetor'whi'chfpermits of a movement The slack,"4 eoimection of the. guidetube. relatively `to 'the' g5 reciprocating part ofthemotorhasafurther functionin 'that it prevents the f important y A1n engagement with thesurfacelof the rock thedrilling. machine is raised sof 'thatthebitported by the same' saltliat .itisbeyond the while the same at thisbeing broken by-'the'blows '.ofthe .hammer g' Instead of effecting 4th`etur11ing` guide tube and the bit by meanso I motor, as shown inFig..y1,.thijs may .beefwhich is mounted on theinclosing'.casing42 v orother stationarypart dfthemachine.soasljy l 1 to be aboye the -"level"ofthe waterwhenifthehv. 11o. f

machine 1s in use. v Motionfmaybetrans motori-to the'guidetube.which-are shown in Fig. 6 andfwhich colinable' bearings o n 4themainframe and` pro# A vided at its lower end withga'f pinion-809"meshing with the gearwheei 37 and'. ahin 5;. I

zontal shaft 14fjournaled"inl'suitable bearlgf; ings on the upperpart'offthe" rfr aiile and* Aconnected by 'ntermeshing bevel gear.wheels 45 in the upper end of the upright shaft and y. by intermeshin'glspur gear In Figs. 7, 8 and 10 other means are shown f' for permittingthe' bit to partake (jf-the lower section of the. gui'detubefand.stillfpqre becoming detached: fro.v the guide tube, these means-qcomprisihgff key 48 arranged transverselyin-"airripening 13y guidetube and the nio- .limited longitudinal @tively @the engine cylinder l of the I la water fected bv means of an air operated motor.4 1 l''limited zlongitudinalfmovement within thejfi f 2 out the loosened stonetherefrom.

i in theloweri guide tubev section 49gand pro 1 jecting with its innerpart into an annular ygroove f- 50 formed in the yperiphery of the inthe tube 'section 49.

For. greater. convenience in assembling f, and dismembering thepartseach of the up'- per vcoupling'seetions 54 ofthe vguide tube 1'0"`which :are similarto the sections 15 maybe split diametrically into twoparts, as shown .in Fig. 11; f f

independent watersupply pipe 55 may .be` .connected withthe waterchamber 156, as ',shown'in 4Fig..6-, for furnishing the neces- 's'arywater which.. passes `from this charnyberdownwardly through the guidetube and intothe drill hole for-removing or washing Instead o femploying a stop collar onvthe v bit, asshown infFig. 2, or a-,keyasshown in Fig.`10, for preventing the bity from be-y v`(':ominggdetachedffromthe guide tube this may beeifected by means'ofinwardly vbent cls iws 57A arranged at the lower end of thef lowerguide'tube'section 58 andl projecting I' 61 ofthef'bit is provided withlongitudinal d which the drillin machine slides-vertically' across Iheadlidable Ventically?'on the .upper'fparts of th guide. bars and jsecuredl to the -r partly underneath .the beveled lfaces o r inclined sides 5.9ofthe blades of thefbit, as shown in Figs. 12, 13,114, .15 and 16. In

this last ymentioned construction the shank grooves 62 which are in linewith the cor` fners-betweeiithe.bladesof the bit andwhich serve asconduits through .which waterf passes from` the fthe. bit"forfwashingxout the stone powder' from'fthe drill hole. 4'0

- for' mountipg this 'drilling machinerso as to' intomor raise thelsfameout of guide tube Ito lthe face) of Although various meansv may be'provided maybe done byli'eans of a derricliwhichis mounted uponfa boat63 and which comprisestwo upright guide bars v64 `connectedfat theirlower ends-,with the sidel of theboat while theirupper end sare braces.65, a cross'fpieceGywhiehjfconne tsr theilower part Vof he guidebarfzmd4 throu' h ame of the .drilling machine, alioi'st ing` cable 68connected lat one end with the movablecrosshea" l land passing V at itsopposite-'end around a hoistingI drum69 mounted '.-theh inggcab l profefly., of s h heft' as-.will

i v-on the-lower part'ofthebraces whilev its in' tennedi'ate"part'passes around a' guidegpul-.

ley attire uppr end'of the brace'sf'and af counterbal ncmg kweight k71k'connected z with The counter? `weight permit drilling'imachineto'descend'b gravi t Same-'$9'bariedmm'ami the' dauin@ @Chine whenusingthe-diuing leachate' foiledy ing upwardly the-#same maybemounted'on a dei-rick similar toithat whichy is .shown in Fig. '19andwhicli comprises a ibase 72`,"an

is capable ofsliding up and down, a. ibrace 74 pivotally connectedat'itsvtupper end `with I the upright-'guide and connected-for -h'ori-.When an air operated *motor is .employed .forrotating the guide tubeand drill bit an zontal adjustment atits lower-end with the -'base, ahoisting cable 75. connected `with the? .drilling machine;y andQat,` one`end with a hoisting drum 6 mounted on the' guide 'while itsintermediatepart passes around a guide pulley" 7 7 arranged 'at theupperljend 'ofthe brace, and a lifting weight`78 connected with theothei` end of. the `hoisting cable and operating normallyvto automatifcally lift the drilling machine solas to `vfeed the bit upwardly as :thevvdepthfofj the hole increases." By turningithe drum 76 vTthe drillinglmachine may be lowered: 1 i

It willibe notedthat my improved drilL ing machine is comparativelyliglitand can bel be readily handled vwith little labi"'and"that 4theksamep'ermits of drilling holes in' rocks rapidly andwithout'lia'billty of forming large chips or becomingcaught 'inthehol'e,

and means for actuating. said' hammer bar. 2. A drilling machinecomprising a Ibit adapted'to engage the. surface tov be drilled,

ahammergbar for operatings'ai'd bit, al guide tubein which saidbitand-bar arelarranged,

'and which is adapted to enter the' drill hole,

Vmeans for actuating said hammer bar, and

.l means for turning,.slid,bit`.v l

.3..HA drilling' hadapted to wengage tu, ,li-rfbe'tobe drilled, f ahammerbar for-'operating said" fit', 1 -guide 9 tube in which b itandbar are` arranged, 1 andiwhich is adaptedto enter theV drill hole,

"Emeans for forcing a clearing .ffluid' .said Hfrom the hole thepulveriizfedylgmaterial -liformed byg-the bit.

through 4.- A drilling machine ,compri ing tube, whichfis adapted toenterl the drill. end of .said

fhole, abit guided on the low'enI tube,fa hammer bar for operatingL4said-'bit tuating said-bar.l 5. `Azdrilli'rig machine-comprisingagguide vtulgep- 'which isv adapted to the p ldrill means for actuatingsaid hammerjbar, and.

guide" tube to said 1 bit for removing.

thereby effecting a material savilngsinthe and which is adapted toenterthe' drill hole," i

ha@ @mfp-liana bit.

arranged lwithin said'tub'e, and means: for Y ing partand arrangedWithinA said tube, a

` to saidry lreciprocating part, and. a drivingl pendently of saidbitmeans for' reciprocat- 10. ingsaid bar for causing the same to strikei i tor having a frameand a reclprocatingfpart, a guide tube mountedon:` said frame, a ham-jh andmeans v:bit mounted onl saiddtube andoperatedby saidbar, a driven gear Wheel connectedwith 'said vtubewandhaving its-lull),A mounted onlA said" frame so asto "be incapable ofaalimited longitudinallyl sliding moyement relative pinion meshing with'said-gear Wlheel 20. A drilling lmachine comprising' a1momer lvbarconnected ,with saidi'reciprocating i part land'arranged Withinsaid/tube, -a bit mounted o`n said tube landoperated by `said i bar, adriveh gear-Wheel connected With said tube and having itsI huby mounted,on "said:

frame' solas t'o bei'ncapable' o'fu axial movevment Vrelatively to lsaidreciprocating part, Ia drlving pinion mounted on s'ald frame andfmeshing /With said gear wheel, andi means' for c ausin'gsaid tubeto'turn With saidgear 'Wheel but permitting a -`limited longitudinalmovement of the tube relativelyvto :said whee1."'

l A machine 'comprising a mo- L tor havinga frame and a reciprocating,part

a guide tube mounted on `said trama-ia ham- Ymer bar connectedl -Withsaid reciprocating partdand arranged Within said tube, a bit A `'niounted lon said. tuberand operated by said bar,`a driven gearlwheelconnected .with said tube' andl havlngl its hub mounted-on said.frame'sos to be inc'apable'of axial move;

ment relatively toy said reciprocating part',

ai driving pinion mounted on said frame and lmeshlng lwith saidYgearfwheel, and means `or causing said-*tube to Iturnfwith Y saidv gearv- 'wheel but permitting aflimited longitudinal movementl of'l the',tube relatively to said wheel. comprising a' plurality: o'f`longitudinalboltsl secured tothe gear Wheel and pass;

" movement'independently lof? s `ing through a flange 'onsaidgilidetube. prising y"a;

i 22., A drilling; machin' n guide/tube, a bitlgui'ded on t the` tube soas to be capabl a hammer bar guided in i'afd'tube, 'indey pendently ofsaidbit,

``1'originanmi,.4 aid tube and;

'Y said bit intermittently and .means\for turning said-tube andbit inunison.

23. AA drilling machine comprising 1a Mguide tube, a .bit guided-on thevlower end of the tube so as to be capable of longitudinal movementindependently of said tube and y. .adapted to rest onfthe surface to bedrilled,

a hammer bar guided in said tube, inde- .ahammer bar guided insaidtube,y independently of said bit, means jfor reciprocati ing said barfor causing the same to strikev said bit intermittently While the.latter rests continuously on the surfaceI being drilled, and means forturning theguide tube and bit during. the "drillinglf operation.

25. A `vdrilling machiner comprising a guide tube-providedlat intervalsWithfinternal reduced bearing portions, a hammer bar arranged in theguide tube and engaging said bearing portions, and a-bit mounted on theguide tube and adapted to receive Vblows from rsaid: hammer bar. i

26. A ldrilling machine comprising a 'bit having a yreduced shank, anenlarged collar vat the inner end ofthe shankfand' blades f at theouterend of the shank, a split guide tube section embracing -saidshankandkhav- "ing the internal diameter smallery than said collar andblades,"a non-.split guidetube, section on which' said' split tubesection is mounted, means-for rotating said guide tube sections, and a'hammerbar reciprocating in jsaid tub'e sections andengagng saidbit.

Witness vmy han/d this 23- .day of May, v14912-.,. "`v v HARRIST.,DUNBAR. l

THEO'. L. Porr,

